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/*
Copyright (C) 2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/property_list.h"
#include "ardour/strip_silence.h"
#include "ardour/audioregion.h"
#include "ardour/region_factory.h"
#include "ardour/session.h"
#include "ardour/dB.h"
using namespace ARDOUR;
/** Construct a StripSilence filter.
* @param s Session.
* @param threshold Threshold below which audio is considered silence, in dBFS.
* @param minimum_length Minimum length of silence period to recognise, in samples.
* @param fade_length Length of fade in/out to apply to trimmed regions, in samples.
*/
StripSilence::StripSilence (Session & s, double threshold, nframes_t minimum_length, nframes_t fade_length)
: Filter (s), _threshold (threshold), _minimum_length (minimum_length), _fade_length (fade_length)
{
}
int
StripSilence::run (boost::shared_ptr<Region> r)
{
results.clear ();
/* we only operate on AudioRegions, for now, though this could be adapted to MIDI
as well I guess
*/
boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (r);
InterThreadInfo itt;
if (!region) {
results.push_back (r);
return -1;
}
/* find periods of silence in the region */
std::list<std::pair<frameoffset_t, framecnt_t> > const silence =
region->find_silence (dB_to_coefficient (_threshold), _minimum_length, itt);
if (silence.size () == 1 && silence.front().first == 0 && silence.front().second == region->length() - 1) {
/* the region is all silence, so just return with nothing */
return 0;
}
if (silence.empty()) {
/* no silence in this region */
results.push_back (region);
return 0;
}
std::list<std::pair<framepos_t, framecnt_t > >::const_iterator s = silence.begin ();
PBD::PropertyList plist;
framepos_t start = 0;
framepos_t end;
bool in_silence;
boost::shared_ptr<AudioRegion> copy;
if (s->first == 0) {
/* initial segment, starting at zero, is silent */
end = s->second;
in_silence = true;
} else {
/* initial segment, starting at zero, is audible */
end = s->first;
in_silence = false;
}
while (s != silence.end()) {
framecnt_t interval_duration;
interval_duration = end - start;
if (!in_silence && interval_duration > 0) {
plist.clear ();
plist.add (Properties::length, interval_duration);
plist.add (Properties::position, region->position() + start);
copy = boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create
(region, start, plist));
copy->set_name (RegionFactory::new_region_name (region->name ()));
std::cerr << "New silent delineated region called " << copy->name()
<< " @ " << copy->start() << " length = " << copy->length() << " pos = " <<
copy->position() << std::endl;
copy->set_fade_in_active (true);
copy->set_fade_in (FadeLinear, _fade_length);
results.push_back (copy);
}
start = end;
++s;
end = s->first;
in_silence = !in_silence;
}
return 0;
}
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